This thread is about tipping in US.In Taiwan when you go to the gas station you do not get out of your car. The attendants put in the fuel you ask for. Then when you pay they give you a receipt and often you will be given bottles or water or tissue papers. It is the customer getting tipped. A much better idea.
Many gas companies have customer VIP cards which I don't bother with that get you even a few more items.
What you do/don't in ROC has nothing to do with US and vice versa.
I was in US yrs ago and the tipping culture at the restaurant was a joke but I just had to accept it.
In ROC you parked your scooter on the pavement, make U turn in every junction etc etc. Do that in HK you will get fine + penalty point and then.....
But that is HK. Nothing to do with ROC.